1) This page might be helpful:
http://en.wikibooks.org/wiki/Japanese:Computing_in_Japanese
2) Non-japanese IPs are banned from posting at Futaba Channel (which is the correct name of the website you are adressing here), the message tells you that your IP is not Japanese and that you are not allowed to make a post there. This is due to foreigners behaving out of order in the past.
You could try posting with a Japanese proxy but they banned most proxies as well. So, I cannot really help you with that.